Is shooting the sword while crouching really just holding down, hitting b and then switching to up really fast or is there some easier way to do it? I can do it kind of consistently when I'm the room before the last boss but as soon as I get in that room I really have trouble pulling it off. Maybe I just need way more practice but it's killin my thumb.

It is absolutely a matter of practice, and it's normal for anxiety to play tricks on us in the final boss

Thanks, I think I was thrown because of how smooth Karma's boss fight is, watching some of the others has made me realize it's not always the case.

Yeah that s the good way to do it i will send you a tutorial to help you to fight the last boss :)